Changeset is not validating data

Questions & Help Questions
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1

Background

I am trying to create a schema with some basic validations. However, when I spin up my app, it looks like the validations are not running.

Code

This is the schema for a reservation.

defmodule MyApp.Reserve do
  @moduledoc """
  Represents a reservation for a guest.
  """

  use Ecto.Schema

  import Ecto.Query

  alias Ecto.Changeset

  schema "reserves" do
    field :guest_id, Ecto.UUID
    field :reserved, :decimal
    field :paid, :decimal
    field :category, Ecto.Enum, values: [:new, :returning]
  end

  def changeset(reserve, params \\ %{}) do
    reserve
    |> Changeset.cast(params, [:guest_id, :reserved, :paid, :category])
    |> Changeset.validate_required([:guest_id, :reserved, :paid, :category])
    |> Changeset.validate_number(:reserved, greater_than_or_equal_to: 0)
    |> Changeset.validate_number(:paid, greater_than_or_equal_to: 10)
    |> Changeset.validate_inclusion(:category, ["new", "returning"])
  end

end

Iex

alias MyApp.Repo
alias MyApp.Reserve

reserve = %Reserve{guest_id: "bcf6dba1-8542-462e-ac16-6cfbe7be4cf6", reserved: 0, paid: -10}

Reserve.changeset(reserve)
#Ecto.Changeset<action: nil, changes: %{}, errors: [], data: #MyApp.Reserve<>, valid?: true, ...>

Question

This should be valid?: false since paid is a negative number. What am I missing?